Back to EveryPatent.com
United States Patent | 6,262,412 |
Hirata ,   et al. | July 17, 2001 |
In an optical pick-up position detector, an optical pick-up is movable by a motor in radial directions of an optical disk for detecting signals on the optical disk. A driver applies a driving voltage to terminals of the motor for forward or reverse rotation of the motor according to a control signal from a controller. The controller has an input terminal connected to a power supply via a resistor and further has a control terminal for outputting the control signal to the driver according to an electric potential at the input terminal of the controller. A switch is disposed between the input terminal of the controller and one of the terminals of the motor. The switch changes its operating state when the optical pick-up moves to exceed a reference position in a radially inward or outward direction with respect to the optical disk. The switch may be connected to the input terminal of the controller via a diode.
Inventors: | Hirata; Minoru (Yokohama, JP); Hijikata; Masakazu (Zama, JP) |
Assignee: | Matsushita Electric Industrial Co., Ltd. (Osaka, JP) |
Appl. No.: | 369934 |
Filed: | August 9, 1999 |
Sep 09, 1998[JP] | 10-270472 |
Current U.S. Class: | 250/214R; 250/201.5; 369/44.29 |
Intern'l Class: | H01J 040/14 |
Field of Search: | 250/214 R,214 LS,201.5,559.29 369/44.29,44.26,44.35,44.14 |
4142209 | Feb., 1979 | Hedlund et al. | 369/75. |
5631886 | May., 1997 | Suzuki | 369/44. |
Foreign Patent Documents | |||
0770993 | May., 1997 | EP. |